Texture with am image pallet, scale your UV islands to 0.01 and drag the tiny island over the color you want then use that image in AGK.
Check out this video for low poly modeling in Blender (and give him a sub he has lots of useful tips)
The problem is when imported into AppGameKit every thing looks flat and bland, use the shades in the image pallet for slight changes on the surfaces of your objects to give them some definition else for example, your piano will just look like a brown blob, use dark brown on the front faces, slightly darker on the top and a slightly lighter shade for the sides.
On subject, does anyone have a "Cavity" shader??
