It's a "bouquet" of prayers that one gathers to give to someone else. So instead of a bouquet of flowers, each one beautiful in its own way, the spiritual bouquet has prayers that people have promised to pray for the receiver: a rosary or just a decade, a chaplet, a novena, a Mass, or a Holy Hour, etc.
Who typical receives one?
Anyone can receive one for any occasion--just like a flower bouquet, but typically they are given to someone who is suffering or experienced a loss. They are for the times when there is "nothing else to do but pray." And really, what's a better gift to give to someone? They can also be given in joyous times--like someone celebrating a birthday, anniversary, welcome, or birth. And they can also be given to aid in discernment--like a new job, new move, vocation, etc.
How do I make one?
The "old fashion way" would be to collect peoples signatures and promised prayers and arrange them in a paper flower bouquet or simple fill them out on a card. This is a wonderful gift for people to receive. However, to ease the collection of the promises and to include people that may be remote, this webpage has an electronic version. You simply follow the instructions below. It, too can be printed out and handed to the person when it is complete, but to make it easier, it can also be emailed. One advantage of this online version to collect is that you can probably reach more people than those you may see in person. Another advantage is that it gives people the freedom to choose what prayers they want to offer on their own as only the recipient will see the prayer offering. No pressure. You can decide to pray what you want, or not at all.
When you are ready to start yours, you can go to this form to start to create one: