Many of my own builds are inspired by pieces of concept art, and one of my favorite artists has been Alexander Iglesias. I’m not alone in this regard; his art has inspired many a mecha builder over the years.
Most recently is Rancorbait, tackling one of my personal favorites, “Rotary cannons for some“.
Simmon Kim has likewise been cranking out a whole fleet of awesome mecha lately, among them this take on The Fiddler.
This flow of inspiration goes the other way, too; some artists have been inspired by the Lego community in their work.