Vinyl Decals 101: How to Make Your Own LEGO Decals - BrickNerd - All things LEGO and the LEGO fan community
Studio PartDesigner Download [BrickLink]
Make your own minifigures
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501st Clone Trooper Arm Decals – Thick's Fig Shop
Creating a custom Minifigure in Stud.io - The Case of Bill and Mary - Christoph Bartneck, Ph.D.
Design lego minifigures decal sticker by Zulfi21 | Fiverr
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TUTORIAL: How to print decals - Minifig Customisation Workshop - Eurobricks Forums