Birch flag coupled with colorful markers.
The item id for Flag Birch in unturned is 1232. You can use this ID with the commands below to spawn the item, give it to a player or buy it on a modded economy server.
Useable: Barricade
Build: Sign
Size_X: 2
Size_Y: 2
Size_Z: 0.7
Health: 250
Range: 4
Radius: 1
Offset: 5
Explosion: 28
Blueprints: 1
Blueprint_0_Type: Furniture
Blueprint_0_Supplies: 2
Blueprint_0_Supply_0_ID: 66
Blueprint_0_Supply_0_Amount: 5
Blueprint_0_Supply_1_ID: 38
Blueprint_0_Supply_1_Amount: 7
Blueprint_0_Build: 27
PlacementAudioClip: Sounds/WoodenPlacement.mp3
Has_Clip_Prefab: false