You can either use a edge punch or lace border punch to achieve the effect on your chosen paper. Another option is to buy different colour doilies and play around with them. You don't need to necessarily follow the rainbow scheme. If you're planning on using them for wedding invitations, you can mix white with your theme colour, for example.
I am just a big fan of simple and extremely cute ideas!
|Lace Rainbow is handmade by Rainy Day Colors|
|Spring Butterfly credit goes to Rainy Day Colors|