A-Z Challenge. The premise, you would start beginning April First with a topic themed on something with the letter A, then on April second another topic with the letter B as the theme, and so on until you finish on April thirtieth with the theme based on the letter Z.
Most of the time if you subtract Sundays from April, you then have 26 days--one day for each letter of the alphabet. When April 1st lands on a Sunday you begin on that day which will be the only Sunday you would post during that month's challenge.
It doesn't even have to be a word--it can be a proper noun, the letter used as a symbol, or the letter itself. The theme of the day is the letter scheduled for that day.
A is for Andromeda Galaxy. 2.5 million light years from Earth it has always held a spot in my heart. When I was a kid I dreamed of people from other galaxies - and Andromeda would be the perfect place to be from.