Hi LAURYN,
I'll list a few shrubs that can be trained of grown against a south facing wall, basicly they should be able to withstand a fair amount of frost and shade.
Chaenomeles ,(japanese quince)
Cottoneaster,
Pyracantha,
Winter jasmin, (jasminum nudiflorum)
Photinia,
Mahonia,
Forsythia,
Escolonia',
Some climbers, like Honey suckle (Lonicera) or clematis may be suitable but you would need to check on the paticular variety, as to the best positioning.
I'm sure others may add to the list, some other suitable plants. Good Luck Tbird+