Thank you very much! Which fractal do you mean exactly? This one?
http://i538.photobucket.com/albums/ff342/formule/Apophysis_090730_924_by_DinkydauSet.pngUse a transform with the variations eyefish and spherical. Then add a second transform with the variations bubble and pre_blur. Choose a high value for the pre_blur variation. Use a weight of 5 for the first transform, and 0.5 for the second transform. You should get something like this:
<flame name="Apophysis-090729-924" version="Apophysis 7x 2010" size="400 300" center="0.253183302394876 -0.539833813039834" scale="34.81" angle="-2.31814631249887" rotate="132.82" oversample="1" filter="0.2" quality="5" background="0 0 0" brightness="4" gamma="4" gamma_threshold="0.04" estimator_radius="9" estimator_minimum="0" estimator_curve="0.4" >
<xform weight="5" color="0.442" symmetry="0.95" spherical="3" eyefish="0.24" coefs="1.006044 0 0 1.006044 -0.00185 0.003613" opacity="1" />
<xform weight="0.5" color="0.597" bubble="0.491" pre_blur="4" coefs="1 0 0 1 0 0" opacity="1" />
<palette count="256" format="RGB">
D7D9CED0D1C8CACAC3C3C2BDBCBAB7B6B3B1AFABACA8A3A6
A29CA09B949B948C958E858F877D898075847A6E7E736678
6C5E7365566D5F4F67584761513F5C4B38564430503D284B
37214530193F291139230A341C022E1D032E1D042D1E052D
1F072D20082C20092C210A2C220B2B220C2B230D2A240F2A
25102A2511292612292713292714282815282917282A1827
2A19272B1A272C1B262C1C262D1D252E1F252F20252F2124
3022243022252F22262F21262F21272E21282E21292E202A
2D202B2D202B2C202C2C202D2C1F2E2B1F2F2B1F2F2B1F30
2A1F312A1E322A1E33291E34291E34291D35281D36281D37
271D38271D39271C39261C3A261C3B251B39241B37231A35
221A332019321F19301E182E1D182C1C172A1B17281A1626
19162418152217152015141F14131D13131B121219111217
1011150F11130E10110D100F0B0F0E0A0F0C090E0A080E08
070D060A15080D1D0B10240D132C0F163411193C141C4416
1F4C1822531B255B1D28631F2B6B212E7324317A26348228
378A2B3A922D3D9A2F40A23143A93446B13649B9384CC13B
4FC93D52D13F55D84158E0445BE8465CE4485DE0495EDB4B
5FD74C60D34E61CF5062CA5163C65364C25465BE5666BA58
67B55968B15B6AAD5D6BA95E6CA5606DA0616E9C636F9865
709466718F68728B6973876B74836D757F6E767A70777671
7872737571737370737070736D6F736B6E73686D73656C73
636C74606B745D6A745B6974586974556874526774506674
4D65744A65744864744563744262744061743D61753A6075
385F75355E75325E75305D752D5C75345D793B5F7D416081
4862844F638856648C5D66906367946A6998716A9C786B9F
7E6DA3856EA78C6FAB9371AF9A72B3A074B7A775BAAE76BE
B578C2BC79C6C27BCAC97CCED07DD2D77FD5DD80D9E482DD
EB83E1E480DADD7DD4D679CECF76C7C773C0C070BAB96DB4
B26AADAB66A6A463A09D609A965D938F5A8C875686805380
795079724D726B4A6C6447665D435F5640584F3D52483A4C
40374539343E3230382B2D32242A2B69654AAD9F69F2DA88
</palette>
</flame>
Then drastically enlarge the second transform, which should be the yellow one. Then zoom in at the first transform, which should be the red one, and start tweaking it.