There were a few ugly-looking icons in one of my current favourite icon themes. So, I decided to replace them with icons from another theme. To match the colour scheme of my present iconset, I edited the colours of the new icons on GIMP, and then replaced the old ones (forward, back and up-one-level icons to be exact). Now, the problem is that these edited icons do not scale down according to the application's need, but defaults to 128x128. Here
is a screenshot of the problem. How do I fix this?