Revised layout
Ok, I saw that I was off with the 7 blocks x 10 blocks as it was a difference of 3, and the majority are a difference of 2. (The comment about adding a row made me look at that.) so instead I took out the bottom row, making it 7 blocks x 9 blocks. Also added the reds to complete the red 'lines'. Is this better? Better to have the reds in a row rather than sporadically laid out? It does seem easier to look at this way, but I did like the randomness of the red also.