jewlry , bangs and lady gaga bow so out there stands out bright shoes idk dnt look like a clown with make-up (:
-great jackets. Get statement making jackets that you can wear that are still acceptable school colors
-hair accessories. Headbands are great for accessorizing with.
-jewelry. Stack some rings, bracelets, or wear a cute necklace. try earrings as well-a girl I know from my school wears great earrings and they really spice up our uniform.
-loop the belt in a cool way
-pops of color. Try wearing bags that stand out, or bright headbands or bold jewelry. Maybe your shoes could be colored too, like red vans :) and since you said any color coat, try a bright coat! or maybe you can put a bright tank top or cami under your button up shirt
-tights and socks. They can be great for accessorizing a uniform. standard black tights are classic, but you can go funkier with some over the knee socks, lace tights, thigh high tights or socks, or you can go with standard crew socks.
-gloves and hats. These are fun to wear, especially in the colder months. Some fun gloves with a cute knit hat look great.
-scarves. There are so many scarves to choose from. To really stand out, choose one that's a bold color or has a cool pattern.
makeup: do your makeup however you're comfortable with, but if you want to spice it up, try some colored eyeliner like violet, navy, or emerald eyeliner. It looks really pretty :) some highlighter on your cheekbones and some lip color look really nice too. If you want to go bold, try a bright lip color like hot pink, red, orange, or coral :)
hair: however you want. Some cute styles are a fishtail braid, waterfall braid, mermaid waves, sleek and shiny straight hair, sock bun, and messy bun.
edit: here are some really awesome socks
http://www.urbanoutfitters.com/urban/catalog/productdetail.jsp?id=25256223&color=004&color=004&itemdescription=true&navAction=jump&search=true&isProduct=true&parentid=SEARCH+RESULTS
http://www.urbanoutfitters.com/urban/catalog/productdetail.jsp?id=25256413&color=004&color=004&itemdescription=true&navAction=jump&search=true&isProduct=true&parentid=SEARCH+RESULTS
http://www.urbanoutfitters.com/urban/catalog/productdetail.jsp?id=19605922&color=020&color=020&itemdescription=true&navAction=jump&search=true&isProduct=true&parentid=SEARCH+RESULTS
http://www.urbanoutfitters.com/urban/catalog/productdetail.jsp?id=21302658&color=004&color=004&itemdescription=true&navAction=jump&search=true&isProduct=true&parentid=SEARCH+RESULTS
http://www.urbanoutfitters.com/urban/catalog/productdetail.jsp?id=25454042&color=010&color=010&itemdescription=true&navAction=jump&search=true&isProduct=true&parentid=SEARCH+RESULTS
http://www.urbanoutfitters.com/urban/catalog/productdetail.jsp?id=24969016&color=001&color=001&itemdescription=true&navAction=jump&search=true&isProduct=true&parentid=SEARCH+RESULTS
http://www.urbanoutfitters.com/urban/catalog/productdetail.jsp?id=25257452&color=014&color=014&itemdescription=true&navAction=jump&search=true&isProduct=true&parentid=SEARCH+RESULTS