There are some exercises which can not be done spontaneously. These require a bit of leg work. Often, this advance work might be in going to a specific location.
To explore some exercises around contemplating waves and clouds, click here.
Though riverside meditations can be done from the comfort of your living room, they are even more powerful when you can find an actual river to engage them. To see a description of the riverside meditations, click here. and here.
The Faith-ing Project 