I have 100% cotton white with large pink flower design curtains, can I dye these a plain blue color?

Dear Angela,
You can dye them, and you will get blue curtains with blue-pink flowers. You cannot dye them to a solid color. The thread will probably not take the dye, so be aware that the stitching, hem, etc. will remain white. Sometimes this is noticeable and annoying, other times not.
Please read through my column for information on Rit, the reactive dyes, and other types of dye.
Have fun,
Jennifer