Some of these are visible in small telescopes, and a few make for very pretty views due to contrast or position. Double stars are usually bright compared to deep sky objects, and thus are easier to find and less affected by light pollution. The challenge lies in resolving or splitting the components. The larger the aperture and the better the optics, the better your chances will be. Use fairly high magnification to reduce glare and put space between the stars.
Many double stars are showcases in even the smallest, cheapest telescopes.
The Double Star Database contains a listing of quite a few interesting pairs and groups. Albireo appears to the naked eye as a single 3rd magnitude star, but in a 2 inch telescope it is easily split into two stars. One component is orange and the other is blue, at least to my eyes. Different observers may see different colors. Some people have told me the stars are yellow and green, or white and red.