MTS, thank you for your suggestion. The Oodles of Doodles is perfect for the border! The blocks, with the color strips on two sides, are 9 1/2". Each of the blocks are a different color and a lime green and a red one have been added since the picture was taken. The colors in picture are kelly green, bright blue, purple, hot pink, bright yellow and orange.
Thank you, all of you, for your very helpful suggestions!