Thank you for the bump. I didn't notice this question earlier.
Well, how much quantum mechanics do you already know?
Do you know about the hydrogen energy levels and wavefunctions? (and what chemists call the s,p,d,f,etc. orbitals?)
If so, discussing the binding energy and wavefunctions of a hydrogen molecule (so you can use the binding and anti-bonding diatomic orbital picture that may have been presented in your high school chemistry). Also interesting would be to look at methane (in chemistry terms, sp3 hybridization of the orbitals). If you want to see a series of the different hybridization of orbitals, maybe: ethane (which is sp3 on each carbon), ethylene (sp2), acetylene (sp).
For pretty "poster pictures", I'm sure you can find stuff on the internet discussing this with pictures.
EDIT: A cursory search shows wikipedia has some nice public domain images you can use, as well as some articles to get you started (of course remember the usual caveat - always use books and more reputable sources once you know what you need to look for... wikipedia should not be a
final destination nor treated as a primary source).
EDIT(2): If this isn't in depth enough (say for instance this all has already been covered in class), I can give suggestions to make it more advanced (more heavily quantum mechanics based) if necessary.
EDIT(3): I'd be willing to give plenty of extra help if you could get a teacher to answer my question :)
https://www.physicsforums.com/showthread.php?t=229904