Full Jar

[Tealeaf]

This is a deck I toyed around with for a while. The name obviously is based on empty jar as this deck is built off the morphing jars as well and milling but does it a few cards consistently rather than a big push and more or less flips the monster/spell-trap ratio (hence being 'full' instead of 'empty'). It is slow but has tested well for me overall due to it slowing down the opponent to it's own level most of the time. It's not perfect by any means but open for ideas to help move it along.

Monsters:27 (used to run 30 or so but cut down would like to bump it up another 1-2 but hard to drop the spell/trap line up.)
3 Morphing Jar #2
1 Morphing Jar
3 Needle Worm
3 Effect Veiler
3 Battle Fader
1 Spear Cretin
2 Marshmallon
3 Spirit Reaper
1 Sangan
2 Swift Scarecrow
3 Unhappy maiden
1 Night Assailant
1 Lava Golem

Traps-2
2 Gravity Bind

Spells-11
3 Messenger of Peace
3 Shallow grave
3 Soul Reversal
1 Pot of Avarice
1 Heavy Storm

Not listing a side/extra though usually include a few rank 3 and 2 xyz just in case. It is obviously VERY vulnerable to Skill Drain and decks that don't play into keeping monsters on the field or that just take them out without flipping though veiler helps there.

[Batsmak]

Even if you're going for the slow game, I feel you should be using Book of Eclipse. It works as a very effective stall card while allowing you to still reuse your flip effect monsters. It also gives you a way to resist Skill Drain (to a point, at least), as Skill Drain can't negate the effects of monsters that are face-down when they resolve. Personally, I don't see The Unhappy Maiden doing anything for you that Book of Eclipse can't do, so maybe switch those? Also, I would much rather use Level Limit - Area B than Gravity Bind, considering the overall weakness of traps due to Decree seeing a lot of play right now.

[Tealeaf]

I went the monster route on maiden instead of eclipse etc. because the fewer cards I mill the better. If I'm milling as much as my opponent hunting for monsters that isn't a good situation for me and they're useless in grave. Also for reusing flips, jar #2, shallow grave, Spear Cretin and Soul Reversal tend to do that for me. You do have a point on the Skill Drain though which may make it worth siding for the deck.

I've also seen very few decrees personally but that might just be my luck.

[BigStinkin'Ape]

monsters 20
3 Morphing Jar #2
1 Morphing Jar
3 Needle Worm
2 Effect Veiler(I'd side veiler all together and opt for 2 worm apoclypse)
3 Battle Fader
1 Spear Cretin
1 Marshmallon
2 Spirit Reaper
1 Sangan
2 Swift Scarecrow
1 Night Assailant
2 Lava Golem

Traps-6
2 Grave of the Super Ancient Organism
2 Dark Bribe
2 needle celing

Spells-16
3 Messenger of Peace
3 Shallow grave
3 Soul Reversal
1 Pot of Avarice
1 Heavy Storm
2 Level-limit area B
3 Book of Eclipse

This build mills seldom and will protect you against monster and trap related woes. Worm Apocolypse is a beast in jar builds for puttin the hurt on back row decks. I'd recommend adding 2 to your won deck if you don't opt for my above changes. GotSAO is a EVIL card in here as it, couples with cards like LLAB can set up jar very advantagously. You should/ could also look for room for pots of duality to better fine tune your options, as you do not special summon on your turn much at all in jar decks.
I am totally with batsmack on the eclipse route verses the maiden route.

hope my suggesitons help

[Tealeaf]

Siding the veiler instead might be a good idea it is a dead card if I end up setting it and I should try to minimize those.