I have a piece of slate that I drilled full of holes, angled in the corner effectively making a triangular box. My intake and heater are behind this, and with the plants in front it blends in nicely. Acts as a great pre-filter to keep the plants out of the intake. I built it to keep my plec off of the heater, as he suffered a rather severe heater burn a couple of years ago, and I thought I was going to lose him.
4/26/2012, lost the finest man. Rest easy Pops...
<--Great Danes are people too!
180g, Fluval FX5, 404, 128watts t-8, low tech, heavily planted, with Albino and reg bristlenose plecs, Congo tetras, Amanos, a herd of Corydoras Sterbai, Boesmanis, a big old common plec, & Otos. 32g tall eclipse3, fluval403, with a handful of bristlenose plecs.180gallon corner in-wall build journal