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This is a paid asset, but now you can download TexturePaint Free.
Detail this asset from Unity Store: Original Link
TexturePaint v1.99
Paint textures while your game runs!
TexturePaint lets you add dynamic
runtime texture updating to your project
quickly and easily.
With a texture or procedural paint brushes,
TexturePaint allows for an amazing level
of control and flexibility.
– Line drawing added!
– Paint on 2D or 3D geometry
– Highly optimized performance
– DX11 compatible
– Great for:
Bullet Holes, modifying shaders/masks at runtime,
painting, splatters, blood splats, shooting out glass,
dynamicly creating holes in walls, trails, etc.