I've got a lot of ideas and don't want to spam the board, so I hope it's ok if I post multiple ideas in one topic to save space. Lemme know if not.

Decor and BG Categories or Tags
It's difficult to shop Branches or Trades for certain types of decor when you're not looking for something specific. Categories or tags could help this. Descriptors like "foliage", "tree", "clothing", "bird", etc. would be a huge help when looking for goodies to spruce up our lions. BGs could have tags like "forest", "desert", etc., since the type of biome is not always featured in the name of the BG.

Tagging everything may be a huge undertaking for site staff considering the sheer volume of decor there is, so maybe user-source them?

It would also be nice to filter our inventories by these tags.

Specific Trade Search Categories for Items
In a similar vein to the above, the ability to search Trades by "breeding item", "decor", "background", "food" etc. Not everyone names the items they're trading in their trade titles, so things probably get missed pretty often.

Trade Search Lions by Marking w/o Color
A lot of the time I find myself wanting a lion with a specific marking style without care for what color it is, but have to go through the marking list color-by-color. This is a small thing, but would be appreciated. The color-specific marking list is pretty daunting.

Trade Search Lions by # of Markings
I've suggested this one before, but it didn't get much traction. Some folks need blank-slate lions and have a heck of a time finding them within the "zomg 11m!!!" market, so this would be a great little addition I think.

Trade Order Options
Basic. The ability to order trades by Least Expensive, Most Expensive, Newest, Oldest, etc. would be nice.

Applicator Previews
If I was to use, say, a CMA, it'd be nice if the site showed me a preview of what my lion would look like with the chosen marking and asked me to confirm the apply. Swapping between the Hoard, Wardrobe, and Wiki pages trying to deduce what marking looks like what on what lion is a bit dizzying.

I'll add onto this as I recall ideas. Again, lemme know if it's better that I post these all individually.