Congrats on your new addition! He's very pretty. I'm not really a big fan of those tacky picture-backgrounds either--but it actually looks quite nice if you put some double sided tape around the top and bottom of the rear of the tank and attach some dark fabric--it hides all the wires and helps the filter intake and the heater blend in so they look much less obtrusive. I have a navy blue piece of scrap fabric behind my community tank and a dark brown scrap fabric behind my planted betta tanks because I figured brown would be more fitting with the blackwater environment bettas come from. Their water is brown from IAL anyway, lol.
But yeah, colored fabric remnants make great backgrounds since they don't reflect light like shiny paper and they don't wrinkle or bubble up or deteriorate when they get wet. Just remember to iron it before you tape it to the tank.