1. Post a memory that you cherish. 9 times out of 10, someone will respond to the post with a similar memory.
2. Post inspirational pictures. A similar blogger has been doing this for a while, and it has received many comments with more words of encouragement or how they look forward to the next post.
3. Did your child do something funny that other mothers will understand? Post about it and see what others have to say!
4. Draft many posts (just don't publish them!) about random things until you get the clutter out of your mind.
5. Take a break from posting for a few hours and just relax. If you don't think about it, the post will eventually come to you!
Another great way that I deal with writer's block is visit Escalate Network and see if there are any new offers that my readers will enjoy. Escalate Network is an affiliate program where you post offers to your readers (that you think they'll enjoy) and you get commission for each legitimate sign-up. The amount you receive depends on the offer you post. You can pick and choose which offers you post about.
If none of those help with writer's block, then maybe you need to take a break from blogging for a day. Your mind may be too cluttered to figure out a post. Don't stress yourself out on posting when you don't feel up to it. Your readers will understand.
Next on Blogging 101: Gaining readership.