I have a function that creates a grid with numbers in particular spots. I can't figure out a way to change the background of cells with numbers in them. For example
grid = Grid[table, Frame -> All, Spacings -> {2, 2}, indices]
where indices is a list {{},{},{}} with the indices of the cells that should have a different color.
Anyone have ideas on how to do this if it's possible?

Itemin the documentation. You need to wrapItemaround the content of the cells that should change color, and then change the color as in the documentation. Example data fortablewith the correspondingindiceswould make it easier to answer the question. – C. E. Feb 04 '17 at 22:06