I am not a huge fan of casual guestbooks, because I find them kind of boring, but I gathered a few unconventional ideas, which you may like!
Let's begin from the cheapest and the simplest idea.
The guestbook in the form of the calendar doesn't require much effort, but looks very original!
You may tell your guests to leave a note on the date of their birth, what will help you remember about every important jubilarian in the future:)
FINGERPRINT TREE
Fingerprinting is very effective and elegant idea.
We can buy a special picture at an online shop but it is a quite expensive solution, so we can also paint or print our own project in the chosen size.
Don't worry if you don't have great design abilities, there are plenty of printables on the internet which you can use for free.
It doesn't have to necessarily be a tree, it can be also balloon or heart... It depends on the imagination.
GLOBE
This is a great solution for people who love to travel.
It looks very romantic!
ENVELOPES
Preparing this kind of guestbook can be quite a time consuming, but is very inimitable.
QUESTIONNAIRE
Asking for your guests' opinion is a very interesting idea.
Guests will surely fill the questionnaire with a smile on their face.
Designing this kind of survey isn't very complicated, but you can also use free printables from the internet.