Just curious if anyone knows offhand if there are any items similar to this, that turn your lower half dragon-like and such.

is probably the best. You may also be able to build on these:

And of course there are plenty of tails and toeclaws to add.

Altering Wearables -Masterpost- may help!

There's also the mermaid tails which you might be able to make look like a dragon depending on what you pair them with.