Ok I really wish that I could take credit for the idea of making roman shades from the cheap plastic blinds but I can't. A genius talented designer did it on her blog. http://littlegreennotebook.blogspot.com/
I just took her idea and made it even easier. In my kitchen I did it her way. I took the plastic blinds and tore them all apart and it was a pain and a mess. They turned out good and I like them but these I like better.
One reason is because they look better from the outside and the other reason is because they are way easier!!
So this is what you do.. First you put up your cheap blinds, they should be around 10 bucks depending on the size. It is much easier doing it while they are already installed. I tried it the first time on the floor (way harder)! Make sure that you adjust the bottom so that they are only as long as you need for your window. If you already have cheap blinds up then all the better!
Next you get your fabric and sew a big square the size of your window. You can double back it depending on how much light you want to go through. I didn't because we like the light.
then you just take your glue gun and glue the fabric along the top of the blinds, then depending on how many ruffles you want (folds in the fabric when you open them) glue lines across.
I posted this picture because you can see the dark lines where I glued the fabric to the blinds. You can also see that I left the blinds totally intact. You can avoid all these lines by double backing your fabric. I took the stick off of the blinds and cut a tiny whole for the string to go through. Pull the string and walah... They fold up as you pull, and they really do look pretty. I told you it was easy! Plus all you see from the outside are white blinds.
These are just the ones I did in the kitchen.
Let me know if you have any questions. I am not the best writer or teacher so let me know if something wasn't clear.
Good luck!!