Fruit that falls off of a tree on Shabbos is forbidden until after Shabbos for two reasons: 1) muktza 2) you might be tempted to pick another fruit. (ShA3 – MB 7)
This applies to garden vegetables as well. If you see them plucked and laying in the garden, don't move them – they might have been picked on Shabbos. (MB 6)
Even if you are certain that the vegetables were picked before Shabbos you may take only one at a time to eat them. To collect two together from the garden would be the melacha of M’amayr. (MB 6)
A piece of hay or straw that is fit for animal fodder can be used as a toothpick. You may even cut a piece to size with a knife. There is no issur of Tikkun Kli nor Mechataych by food. (ShA 4 – MB 12)
A twig that is not fit for consumption is mutkza. Breaking it with your hands to form a toothpick is ossur d’rabbonon. Cutting the twig to size with a knife is a melacha g’mura. (ShA 4 – MB 13)
Since it is disgraceful to show one's teeth with an ugly piece of meat stuck in between, kavod habrios pushes away the issur of the muktza twig under the following 3 conditions:
You have no other non-muktza item to pick with.
You had no way of preparing a toothpick before Shabbos.
It is truly a disgrace. (MB 14)
Fragrant sticks are not muktza. You are allowed to rub them and break them with your hands with the intention to release their fragrance. Do not break the stick to form a toothpick or any other kli. (ShA 5 – MB 17)
Do not cut a haddas with a knife, even to release more fragrance. You might come to cut it to form a toothpick. (MB 17)
It is forbidden to perfume clothing by purposefully putting the sticks into the clothing. (MB 18)
Mechataych is the melacha of cutting any material to a specific size, length or width. The material could be leather, wood , metal or even bird feathers. (MB 18)
Mechataych is ossur both with your hands or with a tool. (MB 18)
Betting with dice is forbidden even during the week – it’s “the dust of gezzel”. (MB 22)
You aren't allowed to cast lottery tickets on Shabbos, even to decide on aliyos l’Torah. (MB 24)