I have just updated my old Ubuntu 11.04 to the 12.04 version and I really dislike the new appearance. Is there anyway I can go back to the old appearance? Here are some examples of the things I would like to change:

• the omnipresent orange colour (for example, colour of the folders, colour of the little x on the top right of the window etc.); used to be blue.
• The icons on the right vertical bar are unreadable: the dropbox icon has become a light grey shapeless blob, the battery icon does not indicate, as it did before, when electricity is plugged in and when it isn't.
• everything is just grey and orange (I chose the Radiance theme, the other ones are even worse). There used to be a lot of options choosing the shape of the windows and so on, where has all that gone?

Thanks for your help!