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.

(42078) MACK Granite

(42093) Racing Pickup

(21311) Megazord by Moko

(75973) Sabretooth and Mechafish

(10252) Grand Coupe by KEEPONBRICKING

(10271) Vintage Coupe by KEEPONBRICKING

Here from a new'ish' channel with its own quirky "Will it modular?" series. Instructions on Rebrickable.

(10265) Pickup Truck by Nathanael Kuipers

(76896) GTR NISMO Transformer by mc tung

(10265) GT40 & Cobra by Nathanael Kuipers

(75973) ARCEE V2 by alanyuppie

75936 JP T Rex

Edited September 27, 20205 yr by Donut

(31102) Transformer Crocodile by alanyuppie

(31032) Red Wyvern by AlteredBricks

(10264) Pub by Versteinert

Alternate Build of 10270 Bookshop 

10271 Classic Pickup by Nathanael Kuipers

 

(71738) Zane's Gundam by Psyro TtunTomato

(21326) Alternative Build Mech by Moko

 

(70842) Transformer Thundertank by alanyuppie

 

(71746 x 2) Ninjago Jungle Dragon by Ron Folkers