Well, now that I (seem to) have fixed bug 86478 (Drop target has severe graphical artifacts), I discovered something neat.
It seems that you can use any old PNG as a drop target icon, and Qt will automatically deduce the correct mask for the X11 SHAPE extension. Right now I have as my KGet drop target my hackergotchi icon (just for testing purposes of course. ;-) ).
If you have a spare graphic that you’d like to use as a drop target, you can do so by doing the following: Make sure that $KDEHOME/share/apps/kget/pics exists, and then save your picture in that directory with the filename target.png.
If this sounds cool enough, I may add an option to KGet allowing you to choose your own drop target graphic.