Check it for yourself..
Here's a list i had on my comp, if you check those items prices and subtract the nature rune i'm sure you'll find some that are profitable. There always are some.
ARMOUR:
- MYSTIC top white - 72,000
- MYSTIC top black - 72,000
- MYSTIC top blue - 72,000
- MYSTIC bottom white - 48,000
- MYSTIC bottom black - 48,000
- MYSTIC bottom blue - 48,000
- BLACK body d'hide - 8,088
- BLACK chops d'hide - 3,732
- BLUE body d'hide - 5,616
- BLUE chops d'hide - 2592
- RED body d'hide - 6,738
- RED chops d'hide - 3,108
- GREEN vambs - 1,500
- BLUE vambs - 1,800
- BLACK vambs - 2,592
- RED vambs - 2,160
WEAPON:
- ADAMANT 2H sword - 3,840
- ADAMANT SQshield - 2,304
- RUNE FULL helm - 21,120
- RUNE MED helm - 11,520
- RUNE SCImitar - 15,360
- RUNE BATTLE axe - 24,960
- RUNE LONGsword - 19,200
- RUNE SQshield - 23,040
- RUNE SWORD - 12,480
- RUNE DAGGER - 4,800
- even DRAGON SKIRT - 162,000 (if you have nothing else to alch ;p)
SUMMONING POUCHES:
First my "top" ones.
- GRANITE lobster - 2,744
- IBIS - 1,889
- MACAW - 1,424
- BLOATED leach - 2,009
- PYRELORD - 1,919
- steel MINOTAUR - 2,369
- iron MINOTAUR - 2,129
- mirthril MINOTAUR - 2,534
- adamant MINOTAUR - 2,414
- spirit COBRA - 1,994
- MAGPIE - 1,574
And less favorite (read: "harder to buy"

.
- GIANT CHINchompa - 1,514
- HONEY badger - 1,514
- KARAMthulu overlord - 2,414
- VAMPIRE bat - 1,469
- fruit BAT - 2,204
- LAVA titan - 3,539
- bronze MINOTAUR - 1,544
- BUNYIP - 1,904
- RAVENOUS locust - 1,439
- SMOKE devil - 2,369
Tell me if you can use it for something
