If you want a half-frame 35mm camera with a hot-shoe and dedicated flash, that can make multiple exposures, is loaded with artistic street cred, and has a really, really cute face on the front of a camera body that's the color of a lollipop, who you gonna call? I think you know the answer: the name's Holga--Holga 135 TIM 35mm 1/2 Frame Twin/Multi-Image Camera (Violet).
The 135 TIM is even smaller than a normal Holga 135, with no protruding lens. It has two inset lenses, and each lens has its own cover--the eyes of the face on the camera. Open one, press the shutter release, use the MX button to re-cock the shutter, close the first eye and open the second eye, shoot again and advance the film. Or you can open both eyes at one time and shoot both sides of the frame simultaneously, or keep re-cocking the shutter to multiple expose your film as many times as you want to.
There's a button to switch between normal shutter (1/100s) and bulb setting, an adjustable aperture (f8, f11, and f22), and the afore-mentioned hot-shoe for the optional (color coordinated) Holga 12S flash with color filters. Did I mention that this camera is cute?
135 TIM 35mm 1/2 Frame Twin/Multi-Image Camera (Violet)