Hey YDL - It's been a while.
Actually, I was only up for the Nobel Nimrod award this year, and I came in 2nd to the entire cast of Jersey Shore.
OK, here's the deal. Those pics are really too small to blow up that large without some major pixelation going on. Not that it's any bother to me, but since you want to know how to change the size yourself, I'll let you see how good/bad these will look and you can decide whether it's good enough for you.
For a somewhat rambling explanation of how I resize images quickly, see this post:
http://androidforums.com/2678948-post2581.html
There are many other online options to do resizing but for me, this method works best to get it to the right size and still get the maximum of the image visible. If you run into any problems, or have any other questions, just let me know.