When I am really stuck for ideas or tired I use a fabulous tool from the Creativity Portal. It is called the Imagination Prompt it is a page where you push a button and it inserts random questions to get your thinking going. For example, when I went there to day, I found the following suggestions:

How old would you be if you didn’t know your real age?
Did you have a favorite blanket or toy? Tell about it.
What was my favorite vacation or trip ever — list 10 reasons why

For example, I just wrote this about “My favorite vacation and 10 reasons why it was the best ever.” in 10 minutes.

Spontaneous: we left for Las Vegas within 12 hours of deciding to go.
Low Cost:: we flew standby which saved our cash for the 7 day vacation.
Splurged: we took the most expensive room we could afford in downtown Las Vegas at out favorite Casino – the Golden Nugget>
A Show-a-Day: we purchased advanced tickets to a new show each day. The highlight as Siegfried & amp; Roy
The Flexibility: WE did what we wanted when we wanted. We slept until 4PM, get up and have breakfast, play the slots, have lunch at 12 midnight, or a fine dinner.
Made New Friends: social butterfly I am not, but on this vacation we met an nice couple and would hang out together.
A Real Rest: I am not sure why but this vacation was the most restful and relaxing of any previous. I think it was because we needed a break and gave ourselves permission to enjoy and relax.
No Schedule: so much of our life is scheduled, calendared, and prioritized. We did not follow a routine.
Poolside: there is nothing quite like a poolside bar in Las Vegas, all the beautiful people, drinks, snacks and swim.
I Won a Jackpot at The Airport: awaiting our boarding call, I decided to play a nickel slot and won a small jackpot. Just enough to go home with a little cash in my pocket.

The key is to try something different to break the Mental Constapation.