I don't know of any tutorial...but I use GZDOOMBUILDER 1.14 (r1699) from the DRD Team (here is where you can find the latest...: http://svn.drdteam.org/doombuilder2-gzdb/ ). With it, making a GZDOOM level, obviously, you can simply add a "dynamic light" via the Things mode. It's at the very bottom. There are multiple choices for them...a regular "Light" (no animation), which is primarily what I use, but there's also "Light, Flicker", "Light, Flicker, Additive", "Light, Flicker, Subtractive", "Light, Pulse" (another fave), etc...etc. After placing it in your map, select it and at the top right (default I think) of GZDOOMBUILDER is a little 'color wheel' icon. Clicking that, with a light selected, brings up that lights properties. You set its color, it's range, and other parameters if it has it (re: a "pulse" light has an Upper and Lower range that it pulses between, as well as an Interval which determines how fast it 'pulses'...lower number is faster, higher is slower).
Anyway, that's about all there is too it, really. I quite enjoy the visual aspects of GZDOOMBUILDER with GZDOOM, combined with super simple ease of use makes it a joy to just dick around with various ideas and such. Thanks DRD Team! :D
Currently I just started a Hexen level. I'm going for a *heavy* 'fantasy setting' theme, with lots of unusual and bright colored lights. I have plans to create a new animated sprite or two for some other ideas I have...but I haven't ever made a Hexen sprite. Come to think of it, I don't think I've ever made any Doom-engine sprite. Odd.
Paul L. Ming, a.k.a., The_Hierarch on some other boards.