Yes, you can. You can open an account in Euros, Pounds or US Dollar, and then fund it from your personal account in whatever currency that is. All funds that you transfer to your account will be converted into the corresponding currency by our bank.
However, our bank applies a 2% charge on the exchange rate conversion, which may or may not be better than what you can get elsewhere.
We suggest that you look into alternatives before sending us money in a currency that's different to the currency of the goal you are funding.
A number of clients use Transferwise for this very reason. If you sign up via https://transferwise.com the first transfer (up to GBP 500) is free of charge. (Disclosure: We get 50 GBP commission for every three clients that sign up via this link.)