Dear {Donor},

Thank you so much for your recent contribution to our campaign. It fills my heart with joy to know that there are so many people out there who believe in what we do and want us to keep going. And keep going, we shall.

Thanks to your generosity, {what will happen as a result of donation}. We really couldn't do this without you—your support makes it possible for us to {help others/change people's lives/etc.}.

{Your Name}

Dear {Donor},

Thank you for helping me with {personal expenses}. It's been a tough {year/past few months}, what with {how you got into your current financial situation}. I really appreciate your support and generosity, and I feel very blessed to have a {friend/sibling/colleague/etc.} like you.

Best,
{Your Name}

Dear {Recipient},

Thank you for the {store} gift {certificate/card} you got me for my birthday. I already put it to good use and got myself {item/service} {yesterday/last week/etc.}. I had so much fun {doing activity}! It's great to be able to pick something you really {need/want} for your birthday. Thanks again!

{Your Name}