Do you do chair dips? I find these really work well for my triceps. Push ups and diamond push ups as mentioned up thread also work well for me. Side planks too.
With weights I like to do bicep curls, overhead presses and tricep extensions, with not too heavy weighs, 8lb each hand. I originally used 5lb which worked fine.
Thanks for all the suggestions. I'm going to try the chair dips sounds good. I've been doing the curls, overhead press, and lateral arm raise. The tricep extensions I do too but never knew what they were called til I looked them up just now. I can't do the diamond push ups but I will keep trying.
