If you want to design a Lopi sweater this site is for you. It's free.
It's also good when selecting color combinations, you can have 2 browser windows side by side with the same pattern and then change the color on one of them and compare it with the other.
You will have to install Microsoft Silverlight, it's a browser plugin.
I want to design a Lopi jumper but do not speak your language. Do you have instructions in English?
Instructions in English on this link http://prjonamunstur.is/PDF/Instructions.pdf
That is a cool UI, with a simple web app, you can be as professional as you want, only need to download Silverlight to work with me, but still fine, it is like the one that I have found at SifaGroup Web Design