Toni, load the pattern up in photoshop (or something similar) and get the RGB colour numbers. Then use
this site to get the DMC thread numbers.

Right now I'm working on a DS cover for my sister (I'm leaning towards Bulbasaur on it, or something Mario themed). I'm working out a pattern now. I'm also considering a Wii "cosy" for my housemate with Mario Karts characters on them (pattern
here). I'm going to modify it a little so that half will be on each side of the Wii and I'll make something up for the top.
This site has been my inspiration all day. I'm all fired up now.
Also, if you're interested
here's what I'm currently working on. I started last November, its for Paul's mum.
Here's what I've done so far:


I estimate another month or so, depending if I can resist the temptation to start one of the other ones earlier.
I gets to go craft shopping tomorrow, because my mum kept all of our extra supplies when she moved. I no longer have bags of left over thread to steal from.