You have to understand her limitations, respect them if you want her to be more open to new things. Trust is essential to experimentation. She has to believe you won't do anything she doesn't want or against her will (even if she ends up having an orgasm from something she thought she wouldn't like). If I were you I'd appologize for going against her wishes in the first place and explain to her as you did here that you just want to try new things with her, that you love being close to her, and only her... and how much you already love everything you guys already do but would love to see other ways you could bring her pleasure.
Some women get insulted off the bat when you want to try new things as it implies you are bored with them, in their interpretation of what you want... even if you are somewhat bored you can't let that be the reason to her or else you are going to end up at square one with a resentful s.o. that doesn't even want to do the same old same old anymore... let alone anything new.
Make sure that you are affectionate outside of sex. That you take the time to let her know how sexy and beautiful you think she is... this will get into her and make her feel more confident in the bedroom. On a night when you are not attempting to seduce, no sex on the agenda... just hold her and talk to her about things she'd be open to trying so that have something to work with that is within her bounderies... and the walls may come down as she gets more and more comfortable.
Its never a good idea to go in with an attitude of ' you never do this or that' ' i bet bobs wife does this or that'... to get what you want in the bedroom the best way is to make a woman feel like she already knocks your socks off and because she does you just want more of her... making her feel insecure, making her feel like shes not adequate at pleasing you, doing things she has said no to... will bring about the oppsoite of your desired results.