This perl plugin shows a mini window in a corner of the screen when a buddy logs in in any account like MSN Messenger. It shows also an icon with the protocol it uses.
You can't directly modify the size of the window. It gets the size from the pixmap. But you could load a new pixmap with the size you want. Simply save it anywhere as xpm and change the variable $background in popupwin. It must point the the full path to the file.
Open popupwin and change the variable $font with apropiate font string. You can use xfontsel to find the apropiate font string.
You can't until the gtk2 port is finished.
Patches are welcome