Images! In the appearance section!

The two < br >s make it so it's not up against the text. The max-width: 90% makes it so it doesn't overflow on a number of devices, and the border color can be changed to whatever you'd like! So can the border radius; 0px is a complete rectangle.

— set by MJ! —

Code:
<br>
<br>
<center><img src="https://78.media.tumblr.com/39060a7715517956fc190bda294263d4/tumblr_inline_o1hoklbJrd1qlt39u_400.gif" style="border-radius: 20px; border: 2px solid #COLOR; max-width: 90%;"/></center>
The two < br >s make it so it's not up against the text. The max-width: 90% makes it so it doesn't overflow on a number of devices, and the border color can be changed to whatever you'd like! So can the border radius; 0px is a complete rectangle.

— set by MJ! —