A simple, relatively-low quality, 2D tileset I made for my game Project Helena 2D (sketch for Castle Game Engine test, but it'll be 3D eventually, so it's an intermediate result).

Most wall/passage tiles are monochrome and colorized in-game. You may also colorize them yourself by GIMP>color>colorize. Cracks are used as overlay to the initial tileset to represent their 'damage level' or just for decorations.

Contains 4 types of enemies (heavy(H), normal(N), medium(M) and light(Q) class) and 1 type of player tanks(T). Folder 'clean' contains non-noisy images.

Also 10-frames animated explosion.

content:

11 cracks
Explosion (10 frames)
Heavy, Normal, Medium, Quick and Tank sprites (8 rotations)
22 passages
25 walls
and a little more