If your computer case has become boring to you, you could try to pimp it up and make it cooler, flashier, darker, funny or try something completely new. You can use a variety of things to make your case interesting, but try to avoid touching the components inside the case, and keep in mind that you will have to open it sometime.
There are many things you can do to your computer case, you just need the right gear and a bit of creativity. You can use many things when making a custom computer case, you can use toys or some parts of toys, action figures, and you can use some USB gadgets and implement them on your work. You can use some old piece of electrical device you are not using anymore like video recorder or something similar. Also people use LED lights because it can be really flashy. If you want to make a custom computer case it would be nice to draw it first and make some schematic for it so you can have a preview of the case. You can adjust your schematic and plan the best build for your custom case.
You must have in mind that you need to leave enough room for accessing USB ports, hubs and other. You will basically need glue mostly, and rethink before starting. See if you have everything you need before pimping your computer case. If you make some error you can try to fix it immediately. You could go on the internet and search for custom computer cases because that way you can get inspiration and you can see what kinds of customizations are possible, for some you will need some skill for others not but there are custom made cases that require a lot of knowledge in technique to be built.
Custom cases can look really good, people usually build themed custom computer cases, and themes go from gaming, movies, and characters to unusual cases that look like a fridge, stadium and other. You can try to be as original as you can be and make some unique case. Try to use a variety of items to make the case better looking and if you are doing a themed one, try to make your case theme based without jumps from the subject. You can make custom case that fits your computers environment to, you can also try to embed your case to your computer table by customizing the table itself. Try to avoid jamming the case inside the table without a chance to get it out.
Main thing when making a custom computer case is access, after that you should think about the theme and materials and finally about the sole process of customization. Customization can be time consuming and usually the results are astonishing and really worth the time spent.