My little guys is also 12 months.
Someone advised me to just keep at it and that sometimes it takes babies many, many, many, many exposures before they are interested in trying something new. So with that in mind I just keep trying. I also read somewhere that babies like to imitate other babies and you might try having another baby who likes finger foods over for lunch. We tried that too. After about a week of offering stuff he's still not LOVING finger foods, but in addition to cheerios he will now eat Baby Mum Mums, Gerber Wagon Wheels, and, my biggest excitement, mini grilled cheese sandwiches (this he did when we had another baby over for lunch so I'm thinking that was a good suggestion.)
Still won't pick up veggies, fruit, cheese, beans, or any of the other things we're trying. But it's a start!