Favorite 1590XX/1790NS Projects?

[dobo2001]

Pulled out an extra 1590XX that I had lined up for a customer that bailed, so now I've got a nice blank enclosure to put something in with all this new free time. What are some of your favorite 1590XX projects that I could put in here? Open to anything!

[gordo]

Lasts ones I did were Brejna's Pangea Vibe and the Grind 800 tube projects so my opinion doesn't count. Both kill though.

[cooder]

5F1 champ made with transformers of an old tube radio.

[Drew Hallenbeck]

Great size for a two-in-one or even a three-in-one project....
See what boards you have laying around and find a couple/few that would play nicely together.....?
I did a handful of these using modded Big Muff and Rat circuits.
Maybe go more ambient/shoegaze and do some delay & reverb?

[alanp]

Doppelganger.

[Bio77]

DeadendFX has quite a few XX builds, Flange-A-rama is one my favs. 
https://www.madbeanpedals.com/forum/index.php?topic=29355.msg284422#msg284422

[Willybomb]

I made a DI with a klon buffer, Bloviator, cabsim, THC XLR linedriver, and 3 outputs...

[Willybomb]

Also, BuGG's Thermionic Deluxe...

[m-Kresol]

Definetely the GrindCustoms STM800 was the best XX project. It's such a shame it's no longer available.