Retrofit a ceiling light with RGB LED tape/lights?
The Tospo is a cheap Chinese ballast.  To find ballasts, start with what bulbs will fit in the fixture (all the better if you have a bulb already).  Then search for ballasts meant to drive that bulb (which also fit in your fixture). I think I see several on 1000bulbs.com in the $20 range.  

LED strips really, really do not like to bend on the flat side.  They will bend only in the direction they go onto the reel.  However they do make LED strips which emit light out the edge ("side emitting"), these can be curled up in a spiral.  

LED strips generally come in 12V or 24V.  You might call it a "transformer" but most of them are digital switching power supplies.  Very likely you can find one that will fit in the site of the old ballast. 

They also do make LED strips that are 120V.  This works by putting 30-40 LEDs in series with dropping resistors.  This greatly reduces the number of allowable cut points.  Getting this and also side-emitting may be a difficult combination to find. Of greater concern: you no longer fall under the "low voltage" rules.  Everything you do is subject to the full weight of the National Electrical Code or your local equivalent. The law requires every part be listed (UL, CSA etc.) and installed properly. Break the law and fire insurance won't pay, and it's downhill from there. This is no place to buy Chinese junk.