Buttons, Banners, and Scarves, Oh My!
I've made quite a few of these, all of them fandom themed (so far, anyway). Stamps were a deviantArt thing as far as I can tell, but 88x31 buttons have been all over the web since before I was born. Scarves, however, are a far more recent thing, for all that they're not all that common anymore. They have their roots in early 2010s fandom culture, and all signs point to their genesis being the house scarves of the wizard school. Baelor started the trend as far as anyone can tell, so they get credit for it, but they're not around anymore.
Fandom-neutral
The Misadventures of Tallulah Casey
The Deep
Make your own!
I made the blinkies through Blinkies.Cafe, but all the buttons, stamps, and scarves I edited myself with Paint.net, even the animated ones. For those, I used the plugin ImAGIF. Buttons are almost always 88x31, but I have seen a few 130x55 ones.
I can't credit myself with all the fancyness, I modified one of the templates from this pack for the Tallulah Casey buttons and the edges of a frame from here for the animated Benthos Files button. If you want to get fancy with the scarves though, here are some templates to start you off!
The code I use to put them in my header can be found here and here. It's adapted from Baelor's original code for tumblr themes, which can still be found through the fanlore page (I've linked it in the sidebar). That code is for all 8 scarves I have hanging, but you can cut it down to only the scarves you need or even add more if you'd like.