I whipped up a window system (J.A.W.S, Just Another Window System) a while back for my game. While the game itself didn't quite survive, the graphics for the UI are worth a small release - so here's a handy sprite sheet to construct your own J.A.W.S windows. It's useful if you're bored with the Windows defaults Construct keeps chugging at you. Use FamFamFam icons ( http://famfamfam.com/lab/icons/silk/
) for colorful and suiting icons.
Just import the sheet to Construct, crop the three parts of each element separately and start making some menu stuff!
Personally I've found this sheet very useful as it's a modern and neat look for any kind of dialog box.