Hmm—this sounds promising:

BlendMe.in is a Photoshop extension that allows you to quickly find a high-quality icon that you can simply drag and drop and then easily continue your ideation. All of the icons are vectorial and have been inserted as smart Photoshop objects, meaning that you get all the icon components as layers (vector objects, adjustment layers, etc.) so that you can easily tweak them to match your creation. [Via]

What do you think?