I tried increasing the size in Photoshop. Image shows the original, 50% increase, and 100% increase. At twice the size they don't look so good. With a 50% increase they aren't too bad. Actual size at 50% increase is 88x90. I don't know why the originals aren't symmetrically square, they are all 59x60. Maybe it has to do with the original rip. Speaking of which, some of the icons aren't clean. The two round ones I resized seem to have some of the adjacent icons attached to the sides. That's an easy fix. If you want me to resize them all let me know.
