At your altar or shrine, light a tea-candle and incense to your patron deity saying,
In honor burns this candle flame,
in praise of (N's) holy name;
In thanksgiving for & recognition of,
all you've done for me from love.
Say a prayer from the heart acknowledgin your blessings, be specific and relate what your blessings meant to you. Make a special offering of food, milk, wine, honey, or a special object to the deity.
When you are done, allow the candle and incense to burn themselves out naturally.