Stand in a circle. Explain that you will collect good wishes for the next iteration, building on each other's blessings. If you do it for the first time, start the activity by giving the first blessing. Then go around the circle to add to your blessing. Skip over people who can't think of anything. When your losing steam, ask for another blessing and start another round. Continue until no one can think of blessings anymore.
Example: You start with 'May we finish all stories next iteration'. Your neighbor continues with 'And may they delight our customers'. Their neighbor wishes 'And may we be able to automatically test all new features'. And so on until ideas for additions to this blessing run out. Then someone else can start a new round, e.g. with 'May we write beautiful code next iteration'.