My name is Ivor. I'm a new comer to the art of bonsai - I've only been doing it for about 9 months - and I would be grateful if you'd help me identify two of these plants I have. I'm also wondering if either of the species have potential as a bonsai.
This first one I think is some sort of Acacia, but I'm not sure...


And here is a closer shot of the foliage:

This second one I really have no idea...



If you click each picture, you should be able to see a bigger size of each.
Thank you in advance for your help.
Ivor