They deserve one, too! (And I can think of a few other bands that should follow them into the dark.)
(FWIW, I often wish I could steal your username. It’s definitely one of those “Damn, I wish I’d thought of that first!” ones.)
Scarlett Fever would make a great name for a drag-queen.
For a Southern woman: Miss Demeanor
Dithpicable Me
Hogan’s gyros
Queen of farts
Always been fond of SKULL BONER myself.
My two favourite mondegreens would make amazing user names:
Fish Islands
Invisible Llama
(Rush, and Frank Turner and the Sleeping Souls, respectively.)
Dead Baron (especially in a Gothic font.)
One I’ve been trying to get someone to take for years is Crap Nelson.
It sounds the name of a grizzled old beat reporter that wears a fedora, trench coat, chomps an unlit cigar all day and keeps a bottle of Scotch in his desk. When I worked in a newsroom, sometimes I’d pretend I was answering the phone “Crap Nelson!” or “This is Crap!”
It sounds like more of a nickname, though. How about C. Rap “Crap” Nelson? 
Professor Lippenchipchalkwitheringlicktacklepfeff.
mathemagician stuck around for less than a week and posted 3 times. Too bad, such a waste of a good username.
Nurse Who
Pinky and The Adenoid
…say, wouldnt that make the person tryin to kill him SCHTOOPY?
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Find a cultural, scientific, or geeky reference with two or three words.
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Replace one of the words with something that rhymes, or with a similar root or rhythm. It’s better if it relates to a job, hobby, or personal interest.
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Into beekeeping? Hi, Lord of the Stings! Network specialist? Hi, Lord of the Pings! Research Chinese antiquities? Hi, Lord of the Mings! Like both the Beatles and amphibians? Welcome Abbey Toad!
A few years back in this thread I posted a bunch from Sifl & Olly, and from a fake commercial on SNL that listed fake band names appearing on the Valentine soundtrack. A few favorites:
Gravel Fork
Pi Eating Contest
Mr. Hameye
Jargon Scott
Delixir Sorbaño
The Breathing Salami
But I think my overall favorite is Dr. Armshoulder Shoozenshorts, because it’s just so much fun to say.
Nosferatitude
Not Your Grandfather’s User Name
I’ve Got That…Whoops!
Hold My Beer…
Stuporman
Post No Bills
Wile E. Post