Here's one that I made, it wasn't ment to use of making GUIs and stuff, but it still is a graphical user interface none-the-less.
Its a music player, and umm.. it plays music, and it uses windows browser windows to load music, heheheheh
Screenshot:
and theres media so i made it a download
P.S. you know TDK, you should make a sort of BlueGUI thing, instead for DBC, i think us all DBC users could do with it, and you're like the only one who could make it
edit:
oh, and you can also choose from different visualisations and theres a replay option and stuff, but I stopped making it cause I couldn't do volume changing or speed changing