You can now customize your own profile pages using html/css. On your profile page, you will see an "edit" button; in that text box (the default of which says "I am a gentle nerd") is where you input the html/css.
User M3D has a link to a profile builder (this might not work for everyone) on his profile page, and has additionally made a github page with some basic codes to help you format your page if you prefer to DIY.
User gracz has some more advanced functions. Ask him to help if you have an idea you’d like to implement.
Basic color codes can be found here.
If you are not good with HTML, but can format a rich text box, you can use a website like this to create the HTML for you. Edit the demo text and the HTML equivalent will appear in the far right box.
Thank you to all of you for sharing your knowledge in such a neighborly way.