Any suggestions would be most welcome.
As you may know, the rate of unemployment in Spain is likely to be quite high for the foreseeable future, especially for young adults.
That said, there may be opportunities for you in the tourism sector, for example. If you can speak Spanish, this would put you at a better advantage. Our Working in Spain and Working in Barcelona pages will give you a good idea of your prospects.
That said, you should check the requirements of your student visa to see how much work you would be eligible to do. Have a look at our Visas for Spain page to make sure.