Well, it depends. Do you pronounce your last name "Boll", "Ball", or "B-"ou as in ouch"-"l?
I'll give it a whack.
Jonosan Baaru
Remember, your family name would come first, so
バールジョノサン
I don't think you'd want to write it in hiragana. Otherwise, people might think you're writing Jono-san, like somebody named "Jono" and attaching an honorary suffix to yourself (which isn't done.)
Plus, your name isn't a native Japanese name, so you'd write it in katakana.
Here you go, though: ばーるじょのさん
"Fancy writing"? Do you mean kanji?
There isn't a kanji for your name.