There are MOCs utilizing whatever pieces at hand to create something unique and then there are alternates using only the parts included from a set to build something else. This thread (I have wanted to start for a while now) is meant to showcase such designs to help inspire your own well as display what can be done within such limited means. Anyway here are a few to get started.

 

31007 - Racing Car by Peteris Sprogis

 

70808 - Super Secret Police Spaceship by msx_80

 

Mobile Frame Zero - 41524, 41525, 41526 by dark_syntax

6866 Wolfsbane by JK Brickworks

 

31003 Robot by Biczzz

 

31006 F1 Racer by Biczzz

 

6913 Speedster by Vinny Turbo

 

4837 Shogun by lk.lkaz

 

6742 Robot by lk.lkaz

 

31007 Tank by Aphylliate

Note:
While the main point of this topic is primarily the usage of pieces within a single set to create a different model shown on the box, the mixing of two or more sets is permitted but the final product must only use those included pieces. Please list the set number(s) of any alternate design posted.

31034 Chameleon by Dvd

70315 alternate vehicle by # KEEPONBRICKING

Someone ( "evilkirk" ) took the 7965 MF and made it more "playable".  It came out pretty good.  I do think regardless of which Lego MF you have, it looks better to make the mandibles longer.

''My mission was to completely rebuild and enlarge the 7965 Millennium Falcon, with the main focus on 'playability' so that all parts of the ship could be accessed from everywhere else, trying to keep as close to the real deal as possible - BUT only using parts from my few non-star wars sets and my ancient 7190 Falcon. 
I used official photos as source material, although I had to use a bit of 'artistic licence' here and there + a lot of the interior decor is wrong due to a serious LOL (Lack of Lego). I could have bought a million tiles for the floor and walls to make it look neater, but that would have taken me off my goal that I set at the start of the build and I like studded floors so that the people can stand where they like as they fly through hyperspace ;) 

 

70320 - Aaron Fox Sniper Mech by legoalbert

31046 Angry Shark by # KEEPONBRICKING

Q1 2017 Pick a Model - PaM-43h "Wraith", PaM-53q "Spectre", PaM-38c "Phantom" by dark_syntax

The 75016 Imperial Assult Carrier is a little bland in my opinion. However, it contains a lot of useful grey bricks to design space sets. My first creation is an X Wing Fighter. It has adjustable wings, a compartment for minifig people, a large cockpit, space for the dark R2D2, and all from the original bricks except for the transparent stand bricks and plate.

31047 Alternate MOC by alanyuppie

31049 Alternate MOC / Robot Mode by alanyuppie

Another MOC using only parts of the 75016 Imperial Assault Carrier: This one is inspired by the wing shape of the LL 928 Galaxy Explorer. I used this as my template for the spaceship shown. It has a large cockpit and a transporter room. This room fits a small glider and a controll platform, which can be left on a planetary surface to do some further investigations. The two blue thrusters illustrate the ion engines, which power that ship. They are located at a safe distance to the cockpit and transporter room, in order to avoid hazardous radiation from the charged particles in the electric fields of the ion engines. 

I am now constructing the original Imperial Assault Carrier, because I am on a creative break. If you have any ideas for another MOC alternate using this great collection of grey bicks, pls let me know✨

Edited February 25, 20178 yr by BoomBoomFlash

Owl (Alternate Model from Mixels series 5) by takamichi irie

The Birthday Cake was boring to look at after some months, so I used all its parts to create a Droid Escape model, because I totally missed to buy the last version. Only the red pants, large grey plate, and stands are other bricks.

31058 Alternate MOC by alanyuppie

10252 pickup truck alternate by KEEPONBRICKING

75877 + 4 in 1 by KEEPONBRICKING

10252 alternate cabrio by KEEPONBRICKING

70904 Rock Dragon by Galaktek

75877 Future Hypercar by KEEPONBRICKING

10252 hot rod by KEEPONBRICKING

75880 Sports Car by KEEPONBRICKING

31070 Retro Roadster by Nathanael Kuipers

70612 Dragon Kid by D.Niel

31068 alternate model by KEEPONBRICKING