This week might seem like a bit of a cop-out on my part, but all I would like to suggest for this week's prayer is that you simply sit quietly and breathe in and out during your prayer time.
Don't just do something: sit there!
You will probably find it helpful to begin by saying a short prayer; "God be with me" will do, as you breath in and out gently and relax your body. But then just sit still.
Thoughts will rise up, but don't pursue them; just let them go as if they are clouds drifting across the sky.
If you find yourself chasing after them or worrying about them, come back to your breathing again.
At the end of the prayer time, thank God for being with you.
More on silent prayer
Article on silence by Paula Huston
The Big Silence - BBC2 takes five volunteers to experience silence at Worth Abbey.
Silence in the City