Are you fundraising? Amazing!
I'd recommend you to set up a fundraiser page on www.justgiving.com. For an example please check my fundraising site for Challenges Worldwide: www.justgiving.com/schouwenburg.
For bigger targets I usually like to order some 'fundraising business cards'. like these:
This will make it easier for people to remember the cause, what it is that you do, and they will be able to visit you site in their onw time to make a donation. this is especially handy for the one's who want to do anonymous donations.
Apart from online fundraising I have been involved in various other fundraising activities. I'd like to share some of them with you. You could think of street fundraising. Ask for donations and give people something in return, like home made Chai tea bags, or cake, etc.
This way you can raise money and have a chat with people to raise awareness for your cause.
Or do something completely different like a tennis ball guessing contest:
Once you have done your fundraiser and you've been successful, share your ideas with the organisation or charity as they might like to promote your work on their blog.