Feel free to update this if you have the inclination, the descriptions are a bit rushed.
00 - flower 1
01 - flower 2
02 - flower 3
03 - koopa troopa hedge?
04 - big turtle shell (green)
05 - pine tree
06 - another pine tree
07 - thin tree
08 - thick tree
09 - hedge 1
0A - clay-ish tree
0B - spikey tree
0C - (shorter?) turtle shell (green)
0D - red turtle shell
0E - spikey red turtle shell
0F - flowering cactus
10 - cactus
11 - (taller?) cactus
12 - shyguy cactus
13 - shyguy brown
14 - green pillar
15 - pink pillar
16 - blue pillar
17 - red mushroom
18 - green mushroom
19 - palm tree 1
1A - palm tree 2
1B - palm tree 3
1C - orange
1D - strange fruit (find name)
1E - piranha plant
1F - red tulip
20 - flower 4
21 - flower 5
22 - hedge 2
23 - 100 sign
24 - 200 sign
25 - 300 sign
26 - 400 sign
27 - +50 sign
28 - flag sign
29 - bob-omb
2A - red bob-omb
2B - pink tree
2C - blue tree
2D - green tree
Using further values creates glitched graphics.