d100 Inside a Gelatinous Cube

Im sure this must have been done but here is mine.
There are some older posts on monster stomach contents

d10 Quick Types
1 Biological 

2 Currency

3 Fancy Stones

4 Cult things

5 Equipment

6 Oddments

7 Weapons

8 Armour

9 Cursed

10 Magic

d100 Inside a Gelatinous Cube
01 Humanoid bones still dissolving

02 Animal or monster bones still dissolving

03 Giant insect chitin plates and scales

04 Dissolving upper torso and head with an unhappy expression

05 Disolving monster faeces

06 Severed hand 1in6 chance has a ring

07 Dissolving food scraps and waste

08 Box of iron rations, naval biscuits or salted food the cube is struggling with

09 Toadstools or mushrooms 1in6 mildly magic type like luminous

10 Luminous green maggots x 2d4 eating the cube and angry if the host killed AC+3 HDd4 Bite d4
11 Copper coins 3d10

12 Silver coins 2d10

13 Electrum coins d10

14 Gold coins d10

15 Platnium coins d6

16 Double sided coin for cheating toss-up games

17 Coin with an edge sharpened to cut 

18 Coin with a light spell cast on it

19 Coin +1 on one saving throw once per day 1in6 chance 3 times a day

20 Coin of an ancient evil prehuman civilisation 

21 Broken large quartz crystal chunk worth a d6gp

22 Amathyst chink worth 5d6gp

23 Opal uncut chunks 3d6gp

24 Topaz fragment 2d6gp

25 Chunk of coral d6gp

26 Polished onyx orb 2d6gp

27 Fragment of amber d6

28 Agate chunk 2d6gp

29 Pearl 3d6pg

30 Jade chunk d6gp
31 Holy symbol medallion 3d6gp

32 Crude small idol d6gp

33 Remains of the cult book with a d4 x10% remaining

34 Weirdly shaped dagger

35 Priest holy symbol 30gp

36 Bottle of holy water

37 Stone head from a statue 3d6gp

38 Candelabra 5d6gp

39 Statuette 2d6gp

40 Brazier for incense 3d6gp

41 Iron spikes 2d6

42 Hammer 

43 Length of chain d6m

44 Tongs

45 Decorated bronze bucket 1gp

46 Copper bowl

47 Ceramic jug

48 Lantern

49 Bottle of oil

50 Bottle of beer
51 Pipe

52 Ivory comb

53 Tin with a sewing needle and thread

54 Tinderbox

55 Lock pick set

56 Giant rat trap

57 Tin of d6 alchemist pills

58 Manacles

59 Thumbscrews

60 Steel spit for cooking
61 Silver dagger

62 Hand axe

63 Shortsword

64 Arrowheads 2d6

65 Spearhead

66 Stone knife

67 Meat cleaver

68 Darts d4

69 Slingstones 2d6

70 Magic weapon +1 d4 1=sword 2=mace 3=dagger 4=staff
71 Chainmail shirt

72 Set of bracers or greaves

73 Chestplate

74 Armoured gauntlets d2

75 Armoured boots d2

76 Iron or bronze cap helmet

77 Steel full helmet

78 Buckler shield

79 Remains of large shield scraps

80 Metal scraps of armour, leather and cloth eaten away
81 Medalion of a lesser demon who wants it back

82 Bottle with a minor evil spirit or poltergeist trapped inside

83 Bottle of poison

84 Bottle of unholy water that can heal undead 2d4 hp

85 Scroll tube with cursed scroll inside or blasphemous lore

86 Cursed ring or armband or headband or torc

87 Cursed weapon d4 1=sword 2=mace 3=dagger 4=staff

88 Potion of delusion d4 1=fly 2=charisma 3=resist fire 4=invisibility

89 Coin with a curse spell on it that ignores the cube

90 Ancient cursed figurines or tablets of the elder gods wanted by a cult
91 Magic Potion d4 1=healing 2=growth 3=shrink 4=strength

92 Scroll Tube with spell scroll

93 Petty domestic magic items like a self-heating pot or back scratcher

94 Skeleton key opens one lock even magical once

95 +1 ring of protection or shield

96 +1 arrows or sling stones d4

97 +1 on one attribute item d4 1=ring 2=torc 3=tiara 4=belt 5=cloak 6=collar

98 Student spell book treated to resist most harm +4 save vs damage

99 Figurine that turns into a real monster if it touches the ground

100 Cloak that allows you to change species an hour a day, most are animals but some are set to turn user human and usable by demihumans and humanoids