Some Icon Ideas

I've been off-and-on noodling over a redesign of my long-neglected website. To that end (and as an excuse to learn Sketch a bit), I've been trying to design a not-terrible logo for myself.

Here's the latest batch of concepts, inspired in part by the shadows in the logo for the Van Buren building in Northeast Minneapolis, from which I work one day a week.

I couldn't figure out how to get the exact effect I was looking for (I'm still learning masks in Sketch), but I find myself not entirely embarrassed by the negative-space logo in the lower-right.