I built a couple laptop stands for Kristen (one for home, one for work). After finishing those up, I had some leftover scraps so I decided I would build some monitor stands for my new displays that came without height adjustment. The screens were definitely too low for me before, now they're just right. I think this will be the single best thing to help me improve posture (and hopefully less back pain). Added benefit: speakers fit underneath which allows me to put all 4 screens (two work + two home) next to each other; this makes it more comfortable to sit at (in terms of chair position / desk legs). A couple of 2x4s, a nice 1" thick piece of wood panel, black paint and polyurethane.

I still need to paint the two final pieces of scrap wood on the leftmost two monitors.