I got a few ideas, perhaps new signs that can complete the colors of the rainbow!

As of now, we have Orange, Yellow, and Green right now.

Firstly, Demonite and Crimtane signs, This will complete Red and Purple
and Lastly a Mushroom Sign, completing the colors!

Red (Crimtane), Orange (Copper), Yellow (Gold), Green (Cactus), Blue (Mushroom), Purple (Demonite)

Aww cute idea! I added a Demonite, Crimtane, Slime, and Rich Mahogany sign. Hopefully that can help you complete your rainbow!

Heyo! Nice little mod here, new materials for signs would definitely go well for builds! If I may suggest, seeing as there a pre-hm metals for signs, their counterparts do not (Tin, Lead, Tungsten, Platinum), having signs for those metals would be good for consistency like many other metal furnitures and add slightly more variety.
Maybe for hardmode, you may also add in hardmode metals signs too? Including Hallowed...? That would be awesome!
Plus signs themed after those glowing moss bricks would be very amazing too. I enjoy the vanilla+ vibe you got going for this!~

I like that! I'll add these next. Tin, Lead, Tungsten, Platinum. After I finish those, I'd like to do a glowing sign... I'm still debating on whether I do glowing mushroom or glowing moss.

I'll look into other hardmode materials after I finish up in pre-hardmode. (I'll take a look at Hallowed first though when I get there 😉). Thank you for the suggestion!

How about a flesh sign with a bone handle? Less disgustingly, maybe a living wood sign with some vines on the side.

Floating martian sign would be cool, especially if it was animated to bob in place a little

We've added a bunch of new signs! If you see any signs you think should be in the mod, let me know!

i've always thought that stone and it's sub-materials were really neglected as a design choice, which is really sad actually, because they look actually cool in places like caverns if you need a little decoration, could you make a stone/gray brick sign?