Create a spritesheet

[bkatiemills]

img/spriteSheet.png is the spritesheet for terrain animations:

Terrain animations consist of 4 frames, each 20x20 px in the spritesheet. The frames are arranged as:

• first row: grassland animation
• second row: forest animation
• third row: blueberry crop animation

We'd like a spritesheet matching this configuration with some attractive animation frames; if feasible, the same spritesheet at a larger size (40x40 and 60x60 px cells) would be nice to have, too.

[padawin]

In the branch issue-23-sprites is a suggestion of animated sprites for the trees, blueberries and grass.
Open for discussion ;-)