Wholemeal pasta is higher in protein, 5g of protein for 100g cooked pasta. Even some breads, if you buy the decent kind, are higher in protein eg Noble Rise's Poppyseed & Sunflower which has 11.8g of protein per 2 slice serving..
Again, all your decent cereals eg All-Bran, which has 6.8g protein per 45g serve..
It's really surprising how many bread/cereal/pasta products have high protein.
Next time you go shopping, check out the nutritional info on breads, pastas, cereals etc. You'll be surprised at the difference between something like a white, wholemeal or multigrain bread and a decent wholegrain bread.
Of course, then there's all your obvious suggestions like eggs, lean meats, dairy products, baked beans etc etc.
Hope this helps