You can always upload new files Marc, a new gallery theme costs new money. I don't have the financial means at this moment to give a designer a green light to create a new gallery theme.
I've made the home, vtec, history etc. pages myself, but the gallery is a difficult piece of code that is hard to understand, even for me as a web-designer.
So if someone is willing to pay the â‚¬250 for a new gallery theme, then please Donate it on my Paypal.