Skins, modification, GUI elements, icons, etc
Rainmeter skin, icon set, etc.
Not whole Windows themes and suites, or at least not due to deadline - those usually take a month to finish, so I'm carefully choosing them.
Windows theme - you name what it should be based on!
Currently I'm not making any Windows themes due to deadlines, so if you request anything, I'll drop whatever I'm currently making and start working on requested theme.
It takes about a month for a Windows theme to be finished.
I will make several concept of Window borders / other elements for you to take your pick from if you want before starting to implement them.