Help please

Hello, so im working with tilemaps to create levels.

does anyone know how to get white tiles? So that i can change the color for each level.

thanks

Make white sprites in Photoshop and use them for your tiles?

Does i have to be a spesific size?

Well, if you want tiles to match on each other, then it would be good to make tiles with same size as your Pixel Per Unit value. 16x16, or 32x32, or 64x64 etc. (i quess)